STUPIDSID
1 (a)
What are the minimum requirements to turn on the SCR?
4 M
1 (b)
Explain two transistor analogy of SCR.
4 M
1 (c)
What are the characteristics of ideal power semiconductor devices?
4 M
1 (d)
Explain four modes of working of TRIAC.
4 M
1 (e)
Compare power BJT, MOSFET and IGBT.
4 M
2 (a)
What is the meaning of commutation of SCR? Explain any two methods in detail.
10 M
2 (b)
Explain the role of UJT as a relaxation oscillator. Draw the appropriate waveforms.
10 M
3 (a)
Explain the single phase full wave fully controlled rectifier for inductive load.
10 M
3 (b)
Explain the series connection of SCR. What are the problems associated with this connection?
10 M
4 (a)
Explain the three phase controlled rectifier for resistive load. Draw the output waveform for firing angle of 30° and 60°.
10 M
4 (b)
What are the protection circuits for SCR? Explain each circuit in brief.
10 M
5 (a)
Explain the DIAC-TRIAC circuit for regulating the intensity of light. (Light Dimmer circuit).
10 M
5 (b)
If the half-wave controlled rectifier has a purely load of R and the delay angle is &alpha=?/3. Determine:
(i) Rectification Eficiency
(ii)Form Factor
(iii) Ripple Factor.
(i) Rectification Eficiency
(ii)Form Factor
(iii) Ripple Factor.
10 M
6 (a)
Derive the performance factors namely; Input displacement factor, Input power factor, DC Voltage, Voltage ratio, Input current distortion factor, Input harmonic factor and Voltage ripple factor for fully- controlled single phase rectifier (Bridge Rectifier) with R-L load.
10 M
6 (b)
Explain the construction, working principle, V-I characteristics and applications of DIAC.
10 M
Write short notes on any three:-
7 (a)
Power MOSFET.
7 M
7 (b)
GTO SCR.
7 M
7 (c)
IGBT.
7 M
7 (d)
Cooling methods of SCR
7 M
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